Leonard henkle



2 Sheets-Sheet 1.. L. HENKLE.

LAMP

(No Model.)

No. 435,377. Patentd Aug. 26, 1890.

2 SheetsSheet 2. L. HENKLE.

LAMP

(No Model.)

No. 435,377. Patented Aug. 26, 1890.

UNITED STATES PATENT OFFICE- LEONARD HENKLE, OF ROCHESTER, ASSIGNOR TOCHARLES STANFORD UPTON, OF NE? YORK, N. Y.

LAMP.

Original application filed May 2'7, 1887, Serial No.

dated August 26, 1890.

239,565. Di ided and this application filed September 25,1889. SerialNo.

324,982. (No model.)

To all whom it may concern:

Be it known that I, LEONARD HENKL-E, a citizen of the United States,residing at Rochester, county of Monroe, State of New York, haveinvented certain new and useful Improvements in Lamps, of which thefollow-- ing is a specification.

This application is a division of my prior application, Serial No.239,565, filed May 27, 1887, for improvements in lamps.

My invention relates to what are known as Argand or central-draft lamps,which employ cylindrical wicks and inner and outer wick-tubes, and areprovided with inside and outside drafts for maintaining constant andeven currents of fresh air to both sides of the flame. p

My invention consists in the construction and arrangement of acentrally-located thimble or auxiliary tube arranged over the inner orcentral draft-tube, having means for retaining the same in properposition and at taching it to the draft-tube, the thimble being providedwith perforations which regulate the currents of air to the innersurface of the flame, as hereinafter more fully described, and pointedout in the claims.

In order that my invention may be fully understood, I will proceed todescribe it with reference to the accompanying drawings, in which-Figure I is acentral vertical section of the central draft-tube ofaRochester lamp, showing my improved thimble or auxiliary tube attachedby means of a screw-th read. Fig. II is a side elevation showing thethimble or auxiliary tube attached by means of a bayonetjoint. Fig. IIIis a detail view, being a vertical section on the line 3 3, Fig. II.Fig. IV is a vertical section on the line 4: 4., Fig. V, showing thethimble or auxiliary tube seated within the top of the centraldraft-tube. Fig. V is a top view thereof. Fig. VI is a vertical sectionshowing the thimble or auxiliary tube attached by means of ascrew-thread within the top of the central-draft lamp. Fig. VII is avertical section showing the thimble or'auxiliary tube attached by meansof a bayonet-joint within the top of the central draft-tube.

' ble and draft-tube A is the central draft-tube, W the wick, and B theouter wick-tube of a central-draft lamp. I

O is my improved thimble or auxiliary tube, which is formed withperforations, as shown.

In some classes of central-draft lamps I have found it desirable tocover the entire space at the top of the central draft-tube, as ithappens at times that eddying currents will form in the chamber betweenthe thimble and the inner Walls of the central drafttube where such anopen space or chamber is provided, and to obviate the drawbacks anddifficulties obtaining in this respect to certain sizes and designs oflamps I find it necessary to bridge the opening of the inner tube at itsupper edge, 50 as to entirely cover it. I therefore extend the thimbleor auxiliary tube 0 over the entire opening of the central draft-tube A,and at the upper edge thereof, as shown, and attach the saidthimtogether by suitable means, so as to prevent any danger of theirbecoming accidentally separated in use.

The perforations above referred to are located in the upper verticalside walls of the thimble or auxiliary tube, and are for the purpose offeeding the fresh incoming air to the inner surfaceof the flame. Inorder, however, to bring about the desired flame efiect it is necessaryto stand the perforated portion of the thimble away from the flame, andfor this purpose I set it inwardly from the top of the centraldraft-tube A, so that when the wick is raised it will not be injuxtaposition with the Walls of the perforated thimble and the currentsof air will be sufficiently blended before they reach the flame toproduce a satisfactorily economical result.

To combine the advantages of the insetting thimble with the centraldraft-tube I have found it necessary to provide an outwardlyextendingannular flange or shoulder C, which extends between the verticalperforated walls of the thimble and the upper edge of the centraldraft-tube A. This shoulder sup ports the perforated walls of thethimble and at the same time closes the central draft-tube at its upperend. The shoulder C extends inwardly on a line flush with the top of theouter wick-tube B in Figs. IV and VI, and substantially on aline inFigs. I, II, and III, and the perforated thimble extends verticallyupward from the inner edge of said shoulder.

Another drawback my present invention is intended to obviate is theleaking or creeping over of the oil from the inner surface of the wickdown the inside of the central drafttube. This is what is known in thetrade as weeping. By providing a rim or collar 0 upon the lower end ofthe auxiliary tube C and fitting this rim or collar exactly upon thecentral draft-tube and connecting the parts together by suitable means,so that they will not become accidentally separated, the oil that has atendency to creep over will be directed back to the wick.

In Fig. I, I show the rim 0*, screw-thread R on the inside, thimble orauxiliary tube is screw-thread S on the outside draft-tube.

In Figs. Hand III, Ishow my thimble orauxiliary tube provided with aslot J, engaging a lug L on the central draft-tube, thus forming abayonet-joint, the lug L being stamped up or otherwise secured. Theoutwardly-extending shoulder C will seat upon the upper edge of thecentral draft-tube A.

Where a short thimble or auxiliary is employed, located on the outsideofthe tube, it is necessary to fasten or look it positively, as by ascrew-thread or bayonet-joint, otherwise the wick when raised woulddislodge it from its proper position. In lieu, however, of screwing orjoining the thimble or auxiliary tube on the outside of the tube A, theparts may be reversed and it may be screwed or attached on the inside,as shown in Figs. IV, V, VI, and VII, where Figs. IV andV show thethimble or auxiliary tube attached by the rim seating on a thread R, inFig. VI by a screw-thread, and in Fig. VII by a bayonetjoint.

\Vhere the collar 0 is fitted on the inside of the central draft-tube A,it is necessary to fit it quite tightly in order to prevent the leakingor weeping aforesaid, and for this purpose, in the form shown in Figs.IV and V, I construct the collar 0 a little large, so that as it formedwith a by which the secured to a of the central is forced in the centraldraft-tube it will spring against the sides and thus effectually securethe two parts together.

In every case the means for supporting and retaining the thimble orauxiliary tube in its proper centralposition is formed in one with thecentral draft-tube, and the complementary interlocking or fasteningdevice on the thimble is form ed integrally with the said thim ble,

so that the intermediate supporting pins or rods which have beenheretofore employed for supporting and centering the thimble aredispensed with. The perforated thimble C will thus be directly supportedand retained in position at its lower end upon the central draft-tube A,or a protruding part thereof.

It will be seen that the portion including the top of the thimbleorauxiliary tube above the shoulder is of smaller diameter than thecentral draft-tube, as the shoulder extendsinwardly from the upper edgeof the latter. The sides of the perforated portion are vertical and thetop thereof imperforate.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

1. The combination of a central draft-tube, a perforated thimble formedwith an outwardly-extending shoulder and a rim, and means for lockin gor fastening the thimble to the central draft-tube.

2. In acentral-draft lamp, the combination of a central draft-tube withthe perforated thimble or auxiliary tube'located at the upper end of thedraft-tube, and means for securing or fastening them to each other.

3. In a central-draft lamp, the combination of a central draft-tube withthe perforated thimble or auxiliary tube located at the upper end of thedraft-tube, connected and locked together by means of a bayonet-joint,as shown and described.

4. In a central-draft lamp, the combination of a central draft-tube,with a perforated thimble or auxiliary tube setting over the outside ofthe central draft-tube and being supported thereby, and means forsecuring one to the other, substantially as and for the purpose setforth.

5. In a central-draft lamp, the combination of the central draft-tube, aperforated thimble or auxiliary tube setting over the outside of thecentral draft-tube, with means for supporting the auxiliary tube andconnecting it to the central draft-tube in concentric position.

6. In acentral-draft lamp, the combination, with the central draft-tube,of a perforated thimble or auxiliary tube setting over the outside ofthe central draft-tube and attached thereto, and closing the latter atthe upper edge thereof, so that all of the inner draft will be directedthrough the perforations.

LEONARD HENKLE. Witnesses:

HERBERT KNIGHT, GEORGE S. BELL.

the two parts being.

